Reddness and raw ...!!

After giving oral pleasure to a casual one night stand. I developed blisters in the corner of my mouth that have since gone away. The real problem is my tongue and roof of my mouth and throat. It is very tender, sore and raw red with pain. If I swallow hard it is unbearable. If I suck my teeth I am able to draw blood. Is this an STD? Has this every happened to anyone before? I am going to the DR's today just wanted to know if this has happened to anyone else.